designing tall buildings: why is it different? a pause for reflection and overview
Post on 17-Dec-2015
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► Axial Shortening
► Foundations
► Speed and complexity of construction
► The sometimes difficult balance between science and unnecessary complexity
► Confidence and over-confidence
► Efficiency and net to gross
Engineering Challenges with Tall Buildings
Lighter, cheaper and more net lettable
► Making tall buildings more efficient
► Global influences – learn from other high-rise nations
► Join the Council on Tall Buildings and Urban Habitat
Al Burj, Dubai – Key Vertical Structural Elements
Hammer Wall
Inner Drum Wall
“Hammer” Mega-Column
Mega-Columns
Fin Wall
Al Burj, Dubai – Concrete Considerations
100 MPa
90 MPa
80 MPa
70 MPa
60 MPa
50 MPa
40 MPa
► Cylinder strengths up to 100 MPa
► Stiffness
► Workability
► Pumpability
► Stickiness
► Sourcing
► Heat
► Durability
► Reliability
Extreme Engineering – 432 Park Avenue, NY
Building Height: 425 m
Slenderness: 1:15
Wind Drift: L/ 400
Governing Period:13 sec.
Extreme Engineering – One World Trade Center, NY
Ht. 1368’-0” (417 M)
Ht. 1776’, (540M)
Antenna & Cable Structure
MEP, Restaurant & Ob. Deck
Ht. 1107’-8”
Office Floors
MEP
Basement
Ht. 186’-8”
Ht. -70’-0”
Ht. 0’-0”Ht. 66’-8” Lobby
Extreme Engineering – One World Trade Center, NY
+ = Lateral Force Resisting System
Concrete Core
Perimeter Steel Moment Frame
Extreme Engineering – 107 West 57th Street, NY
760 ft. (231 m)
42 ft. (13 m)
Slenderness Ratio
23113
= 17.8
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